<!--
 * @Description: 
 * @Author: 赵华宇
 * @Date: 2024-11-09 17:08:48
 * @LastEditors: 赵华宇
 * @LastEditTime: 2024-11-09 17:23:31
-->
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>14-DOM课堂练习</title>
</head>
<body>
    <img id="h1" src="./img/off.gif" >
    <br><br>
    <div class="cls">杰普软件</div> <br>
    <div class="cls">Java程序员</div> <br>
    <input type="checkbox" name="hobby"> 电影
    <input type="checkbox" name="hobby"> 旅游
    <input type="checkbox" name="hobby"> 游戏
</body>
<script>
    //1. 点亮灯泡 : src 属性值
    //首先获取img标签对象
    var img=document.getElementById("h1");
    //然后修改img标签对象的src属性值，进行图片的切换
    img.src="./img/on.gif";
    //2. 将所有div标签的内容后面加上: very good (红色字体) -- <font color='red'></font>
    var divs=document.getElementsByTagName("div");
    for(let i=0;i<divs.length;i++){
        const div=divs[i];
        div.innerHTML += " <font color='red'>very good</font>";
    }
    //3.使所有的复选框呈现选中状态
    var ins = document.getElementsByName("hobby");
    for(let i = 0;i<ins.length;i++){
        const check=ins[i];
        check.checked=true;//选中
    }
</script>
</html>